Game Development Reference
shifted the footage in time, gray had no effect, and areas where the
map layer was black used pixels from earlier in time (Fig. 19.9).
The only parameter we really need to be concerned with here
is Max Displacement Time (sec), which controls the maximum
amount of time from which pixels will be taken. At the default
value of 1, white pixels in the controller will shift those areas of
the footage ahead one second. Black areas in the controller will
shift those areas back one second. Other values will adjust in
between those values.
Figure 19.10 The fractal noise
To see another example, solo the fractal noise PRECOMP layer
(Fig. 19.10 ).
Next change the Time Displacement Layer value on the stairs-
dock PRECOMP layer to the fractal noise PRECOMP layer. Figure
19.11 shows the result (showing a frame that is more illustrative
of what is happening).
The Timewarp Effect
The Timewarp effect is one of the most powerful effects in After
Effects. We can use it to slow down and speed up time, and we
also have control over the speed/quality of how that is done. As
we'll see, the Timewarp effect can also add motion blur to footage
that is already rendered. It also has features similar to the time
controls in the Stretch column of the Timeline panel, except that
the Timewarp effect allows us to also animate speed changes. For
practice with this effect, you can open the Timewarp.aep project
from the Chapter 19 folder.